Re: Toxics in Plastic

["killiman" <killiman at iquest_net>]

In a message dated 8/5/03 10:44:55 AM, David_Koran at HQ02.USACE.ARMY.MIL
writes:

<<  maybe Lee
Harper could comment better about the catalyst used in the "plastic
polymerization process >>

Well, most polypropylene polymerizations use variations of Ziegler catalysts
which are titanium or other metal complexes. These catalysts are not in any
way implicated in the teratogenic effects. One other comment, di-n-butyl
phthalate is never used as a plasticizer for PVC because it is too volatile
and
soluble and would leave so soon the PVC would be very brittle. Di-iso-octyl
phthalate is the only monomeric plasticizer ever used and accounts for some
of the
smell of new plastic -- so it is also somewhat volatile. Most quality PVC
products use polymeric plasticizers which are nontoxic and, in most cases,
approved
by the FDA for food contact. A quick search of the FDA sit turned up this
reference link.
http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?FR=177
.1520
    I am an organic/polymer chemist by training (Ph.D., Cornell, 1954) and
industrial experience (43 years with DuPont). Dave is an equally trained
Analytical Chemist and his detailed reports clearly demonstrate that
difference in
training.

Lee Harper
Media, PA
USA
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killiman at iquest_net
317 253 2170
Al Anderson
317 253 2170

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